中国物理B ›› 2010, Vol. 19 ›› Issue (5): 54207-054207.doi: 10.1088/1674-1056/19/5/054207

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Linearly polarised three-colour lasing emission from an evanescent wave pumped and gain coupled fibre laser

普小云, 江楠, 韩德昱, 冯永利, 任一涛   

  1. Department of Physics, Yunnan University, Kunming 650091, China
  • 收稿日期:2009-08-24 修回日期:2009-10-12 出版日期:2010-05-15 发布日期:2010-05-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60877037 and 10564005).

Linearly polarised three-colour lasing emission from an evanescent wave pumped and gain coupled fibre laser

Pu Xiao-Yun(普小云)†, Jiang Nan(江楠), Han De-Yu(韩德昱), Feng Yong-Li(冯永利), and Ren Yi-Tao(任一涛)   

  1. Department of Physics, Yunnan University, Kunming 650091, China
  • Received:2009-08-24 Revised:2009-10-12 Online:2010-05-15 Published:2010-05-15
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 60877037 and 10564005).

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摘要： A novel Whispering--Gallery--Mode (WGM) fibre laser, emitting linearly polarised three-colour light, is demonstrated by pumping and gain coupling with evanescent waves. The pump light is longitudinally coupled into a bare optical fibre immersed in a dye solution of lower refractive index. The dye molecules around the bare fibre are excited by the evanescent waves of pump light when they propagate along the fibre in a total internal reflection. When the pump beam within the fibre is a meridian beam, the WGM lasing emission from the fibre laser is a linearly polarised transverse electric wave, while it is a mixed wave of the linearly polarised transverse electric and magnetic waves if the pump beam is a skew beam within the fibre. Because the excited molecules are located within the evanescent field of WGM, a good spatial overlap between the dye gain and the evanescent field leads to a high pumping efficiency and a longer gain distance along the fibre. Once the bare fibre is inserted into three glass capillaries filled with Rhodamine 6G, 610 and 640 dye solutions, respectively, WGM laser oscillations at the wavelengths of 567--575, 605--614 and 656--666~nm occur simultaneously, and a linearly polarised three-colour lasing emission is achieved in a single optical fibre.

Abstract: A novel Whispering--Gallery--Mode (WGM) fibre laser, emitting linearly polarised three-colour light, is demonstrated by pumping and gain coupling with evanescent waves. The pump light is longitudinally coupled into a bare optical fibre immersed in a dye solution of lower refractive index. The dye molecules around the bare fibre are excited by the evanescent waves of pump light when they propagate along the fibre in a total internal reflection. When the pump beam within the fibre is a meridian beam, the WGM lasing emission from the fibre laser is a linearly polarised transverse electric wave, while it is a mixed wave of the linearly polarised transverse electric and magnetic waves if the pump beam is a skew beam within the fibre. Because the excited molecules are located within the evanescent field of WGM, a good spatial overlap between the dye gain and the evanescent field leads to a high pumping efficiency and a longer gain distance along the fibre. Once the bare fibre is inserted into three glass capillaries filled with Rhodamine 6G, 610 and 640 dye solutions, respectively, WGM laser oscillations at the wavelengths of 567--575, 605--614 and 656--666~nm occur simultaneously, and a linearly polarised three-colour lasing emission is achieved in a single optical fibre.

Key words: fibre laser, Whispering--Gallery--Mode, evanescent wave, polarisation

中图分类号:  (Fiber lasers)

  • 42.55.Wd
42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation) 42.60.Lh (Efficiency, stability, gain, and other operational parameters) 42.55.Sa (Microcavity and microdisk lasers) 42.60.Da (Resonators, cavities, amplifiers, arrays, and rings)